bug: Unable to choose preselected time through ion-datetime-button using minuteValue

[Ionaru]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v8.x

Current Behavior

When using minuteValue for ion-datetime and the current time does not match a valid time according to the minuteValue, the preselected time when opening the ion-datetime modal, does not emit a value. And the ion-datetime-button keeps showing the current (invalid) time.

Only by changing the time to something else, and then changing it back, will it emit the chosen value.

Expected Behavior

I should be able to select the time the time picker has preselected.

Steps to Reproduce

1. Use this template code

<ion-datetime-button datetime="datetime" />
<ion-modal [keepContentsMounted]="true">
  <ng-template>
    <ion-datetime
      id="datetime"
      minuteValues="0"
      [showDefaultButtons]="true"
    />
  </ng-template>
</ion-modal>

2. Make sure the current time is not a valid value
3. Open the time picker
4. Click "done"
5. No value was selected or emitted, the time picker still shows the original time.

Code Reproduction URL

https://stackblitz.com/edit/sgkfctaz-ahbwunyn?file=src%2Fapp%2Fexample.component.html

Ionic Info

Ionic:

   Ionic CLI                     : 7.2.0 (C:\Users\<NAME>\AppData\Local\nvs\node\22.12.0\x64\node_modules\@ionic\cli)
   Ionic Framework               : @ionic/angular 8.4.2 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@ionic\angular)
   @angular-devkit/build-angular : 19.1.4 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@angular-devkit\build-angular)
   @angular-devkit/schematics    : 19.1.4 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@angular-devkit\schematics)
   @angular/cli                  : 19.1.4 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@angular\cli)
   @ionic/angular-toolkit        : 12.1.1 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@ionic\angular-toolkit)

Capacitor:

   Capacitor CLI      : not installed
   @capacitor/android : 6.2.0 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@capacitor\android)
   @capacitor/core    : 6.2.0 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@capacitor\core)
   @capacitor/ios     : 6.2.0 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@capacitor\ios)

Utility:

   cordova-res : not installed globally
   native-run  : not installed globally

System:

   NodeJS : v22.12.0 (C:\Users\<NAME>\AppData\Local\nvs\default\node.exe)
   npm    : 11.1.0
   OS     : Windows 10

Additional Information

Related to #30183

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